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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d7f3eabc563235fb65db70f2654a47aab1984506e75f52a46265aa419c79f2' 
  AND token = 'D5T9KfX5ideGFIJ8Fu2WXiuPYtBHhLL0Laxk3z5JElc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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