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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1edcdbcfeaf905ecccb2688df9c372c9accbb6b2098b6d10ae8370e4ab850c2e' 
  AND token = 'UfKwF/h+eARkAhEyXi6axADJeuziwzjC1Y+uL6j2FpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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