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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de2f5d03497d2b67ccdd4f4aee7790d7054acf79bd40c54930efdd239d9f50c8' 
  AND token = 'kS/UHgUSQBBCIjV2W4FmpfkruttLmQblNQTUyrp+9uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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