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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da522b927130e0810dcd28632649410c37b86c08f5a5c7f93ebd5e3e0a379a5a' 
  AND token = '1e+4edRB0WuwzTf32HqM6GaZvBLuDpvZLK3LYiMXzH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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