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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e48701b115dff1a03fb01d6bba7b1de593e52547e43ef86fb9b25269f7c560' 
  AND token = 'Cif7lxxfrSaSE5aMkdHb0Cydy8cnIvdczT9EOZ2avkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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