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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0ef01d96b3de029414a94abf13f8b2f4356291ac88f2e4e9168249890cbbd8' 
  AND token = '5EazYLNcx448Ycn2FSZ16JmC1iAwR1IB3A8hUUwSbFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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