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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2593733e811aa5727a7e959f8ee111a98edb9318e6768f4804211dfb98ec3856' 
  AND token = 'Pauhhm7YC1Z8iSOwx0gn7ki/oc5gJW36vtrD23JEtCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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