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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1727ec99872294b01f0878646b914078df5d880cea5bf1464fd2159780895992' 
  AND token = 'mieN4Fh3apXhQMDcyhJEJEd9e66cuLWg5q/1bAfOvO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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