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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10961fffe7e55e72f9489cba9581a94235a0a20b1bd8c4caf1b408275d70e73a' 
  AND token = 'C2lw43OrS9H257FKurCPO6fvrbKwUD8Ll4w9RcfXe2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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