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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e717f073de02a2973435972ef9e60aba8ad1ba2b5026d6406c67362a5e72dd' 
  AND token = 'f4xcQNZOln9VALA4X/0KVRCATfo86g2+bZ0/cfs91UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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