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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4851ea2b732fac4b4c853de6850a2b3bed815b8beb9138f512ed0a16c6955f4d' 
  AND token = 'N6Hmf3lC7P1enjQUzE9d7kAKrrcKFqktt0/hAl3RwhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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