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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ec7a66bf8f197ad0c6f85ae1062f8fd3c4d9b93c95c5cbabad41d95f0142a8' 
  AND token = 'S2R/qYKGTK4EPLTk60QY85ZGVbgMZraBeXenW5AUK0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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