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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33468264a3d76d13ea3d80783cca7ffd9703107a0b7e3d0c124e510236ca881' 
  AND token = 'DG/Sm+mwG2IjsG7lz11OxNfV+3TBy4eSNrmh28RKckA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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