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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9726439be6e108b65c8e2c0939a274752548e44603b8f7eadce38733dc1be0' 
  AND token = 'IHZAz857torBzp5iAc47f2J6ju+xftmhOFJachlKJfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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