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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6b955393c1a607e768c278e522e47a8dfd1eaa56fa3d7307f75328819f2e83' 
  AND token = 'cWUyLaUVWamJvufrMHfCfHp8TBArsej2nOsHH7Tr+hQ=' 
  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"
    }
  }
}