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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6dbeffe1bbda97f116cdbe486d0f239a9051e891a6c506f946425aed3119bce' 
  AND token = 'YrWruRXN+UZHH1uG5i+UEJ+ofeiuJM6y8hI7mNvNwUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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