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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a373c7231602474d8aada931e50786f1fb6ba0c738b5930b5bda37ca2610ef72' 
  AND token = 'CSVFpoeUm05weKqVEW7MG0k5k+C8dgwkjdD8VFxKvz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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