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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39b87de77db052b0c4d26ea1c7aa0b8db1922906eb350080bc55665afd758ea' 
  AND token = '+9BvvoLGqJB3OOa/E9vaxOW41q+KVU5PjFQHRT6hWSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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