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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbfee23071ff8c7a980c60214c2d2db4c9f2e64c6b2d60152f50c9ed56ec21b6' 
  AND token = 'YdeN3VgxAjE+pqxc3inrH+xrbyfr+zZyMgS0i/UrXyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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