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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669c1834c9f1d8af19acbdec8e85a88b9310dff6133f362f87b2762bf7122c1c' 
  AND token = 'G7NdIWLyySuJf9JIuyDRbfAs1nnEfTYLVHHaU8dW9ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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