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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33b3b48643709e5d4821d34e8e90f53c679c4df5812450731c4fe3eea1c1b4f' 
  AND token = 'rIzy90mSA9bRZXSB9fkjKTVMdYPuAEm24s07zPmLGgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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