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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0071c30650d27dcd34c842477f10cd541815437c5105ed65e17de64558c2f3bf' 
  AND token = 'BSTZmg7WBz234CAIeSVWWDeS7iKopCK/bWED1Wvgr6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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