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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2cf497555f9f87233faa6a10e91806b2bfe60e990b94c4a9b04befdd5e0d712' 
  AND token = 'vUQ1HIHTxQyk7dLwEdsu2oi1kHh/4sXSBlisK88vfTw=' 
  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"
    }
  }
}