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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83cb734351158dfd338f571045d1c7bb56ccc1faac16c0a42a0f427add6252cd' 
  AND token = 'zgJzlkqwxDo5L5ebo74DUcGSB4k0WqrrWQ+Ookt1+jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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