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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84a1b47aceaeef5dd0b63a71c9e6acf058e13559a7f1c41eb81700c973eac5f' 
  AND token = 'yeAjg3D1uN1ZJnnyw8EK6wJ6g3jzVw1gEivWqXHT8M8=' 
  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"
    }
  }
}