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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafb9626bf9dfca9853d93c553d9d2f8e51e0b1dba84bb5e4fd5a3f7c60f3d76' 
  AND token = 'VOPF/C8Fca9pGOGivbk5NH9XGfJ0a7CNyCSAEceOE94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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