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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7894721c4f16cfc79e0c080aee1f75168d74ee147c75b5819ba57d08bb9a5b63' 
  AND token = '9lVk38qjahLBRP6ZxM6opf6QabaR0N7FZdBIKk78kLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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