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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25ef48d2b2fabeeac509744d15303574e17e5ba9e732b1ed8154c04138ee1d8' 
  AND token = '0tndUsEzpzeZQziTMwTo2jEGT5bo+P9pWUmwYV2P65w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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