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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a0a54b99e37155c60245596645a9ff854712a382b9ee748472a8bcca741981' 
  AND token = 'TDqalvUcX9vV4J2yUWwYK7bi3IboX+p2LPjEW/muedw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}