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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69689f8f06aaa7c832720fcfaafcd6eaf060b0116f3cba7c4dccd1acf53d31ae' 
  AND token = '/E0qHhQg1E2pE60QtWSwfA2HA9k2M9woNhhUAyq91qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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