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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6db6be527ecf1a4b8cb2faa2a9b59e80bc2f19f2b9644da86e8e3817e62de25' 
  AND token = 'i2jN9+AFfgNJmISZLjEv5CIHyq8yg23iF9HF6OcXHPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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