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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5267f4c6a082edf8fa33e8513abca87e7045636ef9f2fc9596c4dbe6f2f2ef0b' 
  AND token = 'Z79a5tSG+OX24TmQY0TtirWKQtuHq7BKdXH+ydfR/UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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