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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddad024691772ab0012d10b1e18c4e85fc7126b7921a287dbd5537bb2a9b69bf' 
  AND token = 'e7b5ADb7QSXRHPCwr+1rhIoZw2ep71JsOgtUQgn+4Bg=' 
  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"
    }
  }
}