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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18e6e85f70c4feca6eb4c5da630cf1f38e5a14b31a0a6812acbbbb767f464dc' 
  AND token = 'OJxJOu5L4H2UfuNxXS61PE/WpmnAfxItrWYDUU+TNIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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