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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019b8929e5761831bc70afcc31286a338f498c1792917bbc68a8f83de75beae6' 
  AND token = 'dy5M794gxLwBy8jMTgCRq3JuzjnZaxriQyx5pnBW2zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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