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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb469dce683566186d331ada6c0c35571ca25eac2d07c1c0db9b4876b712ccb8' 
  AND token = 'GsBF4DUvjWCklAj1JdUpsfxr+LFQ93o6XQLu8gyCpq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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