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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c4136fbe5e5919e1b4ddefd08aa6eb1cd4d653ae592934e61a88062594d4d6' 
  AND token = 'gPlPZ1CiQ6JYpmcfeOeYOLBtDGCn7sLOpf8wLvz8yBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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