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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b515fc8092a3f4ec9dc7e761af4f7898dee34d51d2d3f608cc493fac0cdc5a9' 
  AND token = 'CJxlsb1lijy6PfcrOh7IE2HeagkKLEVBoGGFq7i9FMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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