SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e163f2cb66708fad3bdd17b62695cf831141e77b039c32cb4af5cb26e9cd06cc' 
  AND token = 'PWTBJpgOMGz3y4Dlw+wQluu/NI0ABQYu3+0j5IXviTA=' 
  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"
    }
  }
}