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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f7c4941e647046f9b66d59a23461e4f17584536cedcfc25105b17b3871fdd3' 
  AND token = '1ybqi3gk5/t8xp4WW6IvaKz6o+gLgaxQV0wp9/fPeyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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