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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54bdd6526a8d1d0f24da870905aa72459d60d7b3600bab97c993dec52fd30ad4' 
  AND token = 'sPN/gruJNAlFWQ99Esk1QT9NyRzIL5G9VBdaPLxhHPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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