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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9ba84af01980b21d7fc7f5d67577e8fa0101816675b99ac81e5698536097d8' 
  AND token = 'Z1vl95tZqTqKXF8LkWTeXJ/uKtq2eMpygcD5Mm/5vUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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