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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e912fa8a7fb0b534abd1d4da04af40d578e51e9c24d09ab49a96af18f60813' 
  AND token = '4TUk7m1Dht1v7tG55YjAApdNfk7HrRaAV19QqfnVLU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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