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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3ca951fce4a2fe059c85d38e13bb79a01bb916092c8800cbb451290103c4cd' 
  AND token = '1y9x9XHnEty6XFQJINxaIK9eSZ77+9QIw/6NcD145/8=' 
  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"
    }
  }
}