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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05fb0971b815babd7723ccf6619ac1cea4d06cd9ddbd99d06d0b7339ef1c1aad' 
  AND token = 'rg4I+gpueyqZR1uQz8tqBNGzIeKuHOb090CknfjOZg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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