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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da284c3996844cdb4ecb11b24dbf6da3b1440a9ad54cf8e3a9f0cfa1fd8e1f9' 
  AND token = 'FMlpm8cKj9gOiJ/Ri7nSeXnig/QOhytC+++HK1VtFBE=' 
  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"
    }
  }
}