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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910fdce94e1618a015ab2153dc38342e44678a18b7e9372f487c00a22592d1de' 
  AND token = '40XYV82YKjw4yVaX4vOU7chhMwlZF0f7lFuHf5CQvYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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