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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c97f353c4a020e201f8e52d70c9585480cbd7f4aff5547c538675714ccb82c' 
  AND token = '8dgjG+jHzfubcSuILVRkB1/3WRU9W4UZ34joa8a2edk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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