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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e179d25dc05bfd7c94383924e91fb4fc1e28fbda2481ec6d1e88f69fe440433b' 
  AND token = 'q55X4+IqtdlpiIWh/ioxBX4ZQEK2SRRdSf+LbJPCnvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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