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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149802c2b9f01af18ed7325046fce01668341f4701de569f38c2a5b5b85be260' 
  AND token = '80oZYGpI6nOWeUI8Ap+zaIN1AbZ/cT6XrMhhQ98ryhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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