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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350c2d83bca95ec1b8368447a4f85ce716fe278e50d9f3868aba2eafd6524764' 
  AND token = 'mzb1gs3qzrr/iDBkk5QqMLZD3nTPH1rE6lPBOArovt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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