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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b1b15a25aa57072b45a1737fdea458321d9228c5a739710ca9162d860cf96ca' 
  AND token = 'WAuuENYb5qmHGcnUDHUXHh5B8cmIkr8qenrWZDV7EoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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