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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2a78838225bd61831830d679480449eb1b4199ea3dd38dcd7194b3955b4ccd' 
  AND token = 'gHtGiSs54RX5zTTJ5rfGIHCfmVZRvPTH90Ug7D6gflc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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